Bi-annual	US dollars
1987-06-30	697
1987-12-31	715
1988-06-30	563
1988-12-31	687
1989-06-30	744
1989-12-31	764
1990-06-30	781
1990-12-31	849
1991-06-30	871
1991-12-31	869
1992-06-30	801
1992-12-31	515
1993-06-30	854
1993-12-31	2554
1994-06-30	2998
1994-12-31	3159
1995-06-30	3711
1995-12-31	4372
1996-06-30	4260
1996-12-31	4814
1997-06-30	4487
1997-12-31	6153
1998-06-30	6899
1998-12-31	6109
1999-06-30	5476